The average for us is about 3.5 minutes to find the flight, after on average looking at 3 screens of flight summary’s, and .20 screen views of calendar comparable pricing. Most people don’t use calendar as they are focused on particular days.
About another 2 minutes to complete passenger details - longer now as domestic international airlines require more information than just a name.
About another 2 minutes to complete credit card/Bitcoin payment with reply from payment processor of success.
So from landing on site to having confirmation of booking in hand…. about 7.5 minutes.